You're gonna need a digital scale, though. Man, I watch WAY too much Alton Brown.
In a cocktail shaker with ice combine
63 grams (or cc's, since we're measuring liquid. assume 1:1 ratio for water to booze for this drink) of gin
9 grams of extra dry vermouth
13 grams of Stirrings™ Blood Orange Bitters
Shake until shaker frosts, pour into a chilled glass.
Quite nice. Especially with tales of Old Hollywood on the DVD player.